Officers learn techniques to recognize human trafficking, intervene if possible, and how to conduct proper investigations.

"Local police have never been shown how to identify what could be human trafficking. Whether it's in the prostitution trade, whether it's in children, whether it's in workers," says Chris Braun with the Pennsylvania Chiefs of Police Association.

Braun says officers involved in human trafficking stings along with federal and state prosecutors help design the course.

"That takes some investigative technique. The training is not necessarily to look for illegal immigrants. We try to be very careful as to what we're investigating. The training is geared to look for human trafficking."

Braun says illegal immigrants may sometimes actually be part of a human trafficking ring, and victims themselves.

Pennsylvania is often described as pass-through state, meaning victims are often moved through the commonwealth.